K474 :
a^6*c^2*x^2*y + a^4*b^2*c^2*x^2*y - a^2*b^4*c^2*x^2*y - b^6*c^2*x^2*y -   2*a^4*c^4*x^2*y + a^2*c^6*x^2*y + b^2*c^6*x^2*y + a^6*c^2*x*y^2 +   a^4*b^2*c^2*x*y^2 - a^2*b^4*c^2*x*y^2 - b^6*c^2*x*y^2 +   2*b^4*c^4*x*y^2 - a^2*c^6*x*y^2 - b^2*c^6*x*y^2 - a^6*b^2*x^2*z +   2*a^4*b^4*x^2*z - a^2*b^6*x^2*z - a^4*b^2*c^2*x^2*z - b^6*c^2*x^2*z +   a^2*b^2*c^4*x^2*z + b^2*c^6*x^2*z + a^6*b^2*y^2*z -   2*a^4*b^4*y^2*z + a^2*b^6*y^2*z + a^6*c^2*y^2*z + a^2*b^4*c^2*y^2*z -   a^2*b^2*c^4*y^2*z - a^2*c^6*y^2*z - a^6*b^2*x*z^2 + a^2*b^6*x*z^2 -   a^4*b^2*c^2*x*z^2 + b^6*c^2*x*z^2 + a^2*b^2*c^4*x*z^2 -   2*b^4*c^4*x*z^2 + b^2*c^6*x*z^2 - a^6*b^2*y*z^2 + a^2*b^6*y*z^2 -   a^6*c^2*y*z^2 + a^2*b^4*c^2*y*z^2 + 2*a^4*c^4*y*z^2 - a^2*b^2*c^4*y*z^2 -   a^2*c^6*y*z^2 = 0